The Ten Letters of Seneca You Should Read First
Introduction
Toward the end of his life, retired from politics and living under the shadow of an increasingly dangerous emperor, Seneca wrote a long series of letters to his friend Lucilius, a younger Roman official. One hundred and twenty-four survive. They are among the most widely read works of Antiquity: brief, personal letters filled with everyday examples and advice on how to live better.
Yet 124 letters can be intimidating. Many people buy the volume, read the first few, and set it aside. This article proposes ten letters to start with, offering a summary of each, its central idea, and a practical application. Read at a pace of one per week, they form a ten-week mini-course in practical philosophy.
Seneca did not write treatises for experts. He wrote letters to a friend, which is why they read as if they were written for you.
The ideas here are summarized in plain language. To read the complete letters, look for an annotated edition with a named translator.
Letter 1: Time
What it is about: Seneca urges Lucilius to lay claim to himself and recover the time that is taken from him, stolen from him, or slips through his fingers. The most shameful loss, he says, is the one that happens through carelessness.
The idea: Time is the only thing that truly belongs to us, yet we give it away without thinking.
Application: For one week, write down each night where your time went and how much of it you lost through carelessness.
Letter 2: Reading Well
What it is about: Seneca warns against scattered reading, jumping from one author to another. To be everywhere is to be nowhere. Better a few authors well digested. He closes with a thought borrowed from Epicurus: it is not the person who has too little who is poor, but the one who craves more.
The idea: Depth matters more than quantity, in reading and in life.
Application: Choose a single book for this month and finish it before starting another.
Letter 7: The Crowd
What it is about: Seneca admits that whenever he mingles with the crowd, he comes back worse: greedier, more ambitious, more cruel. The emotions of the crowd are contagious. He recommends spending time with those who can make us better and those whom we can help improve.
The idea: Our environment shapes our character more than we think.
Application: Review who you spend the most time with, in person and on social media, and ask yourself whether they bring you closer to or further from the person you want to be.
Letter 11: The Role Model
What it is about: Seneca recommends choosing someone worthy of respect and living as though that person were always watching us. He suggests Cato, or if Cato seems too strict, Laelius, a man of gentler temperament.
The idea: Having a role model helps guide our conduct, especially when no one is looking.
Application: Choose your role model and, before every difficult decision this week, ask yourself what that person would do.
Letter 12: Old Age
What it is about: Seneca visits his country estate and discovers that everything has grown old: the trees, the building, even a slave who had been his childhood playmate. Instead of lamenting, he reflects on the pleasures proper to old age and on living each day as a complete life in itself.
The idea: Every stage of life has its own goods, and each day can be lived as a whole life.
Application: Write down three things you enjoy today that you could not enjoy ten years ago.
Letter 13: Fear
What it is about: Seneca writes to a worried Lucilius. There are more things that frighten us than things that crush us, he says, and we suffer more in imagination than in reality. He proposes examining whether the feared evil is certain, whether it is imminent, and whether it is really as bad as it seems.
The idea: Much of our suffering comes from anticipating troubles that may never arrive.
Application: Take your most persistent worry and answer Seneca's three questions in writing.
Letter 18: Voluntary Poverty
What it is about: In the middle of Saturnalia, the Roman festival of excess, Seneca proposes an exercise to Lucilius: spend a few days living on the bare minimum, with simple food and rough clothing, and ask yourself at the end whether this was really what you feared so much.
The idea: Anyone who has practiced living with little loses the fear of losing what they have.
Application: Choose one day this month to eat very simply and make zero optional purchases. At the end of the day, write down what you genuinely missed.
Letter 24: The Mask
What it is about: Lucilius fears the outcome of a lawsuit. Seneca advises him to picture the worst and prepare for it, reminding him that we must strip the mask not only from people, but also from circumstances, to see their true face—just as children are frightened by a loved one wearing a mask.
The idea: What frightens us loses its power when we look at it directly and precisely.
Application: Define in writing, in a single concrete sentence, what you fear most right now, and write down how you would handle that worst-case scenario.
Letter 28: Travel Does Not Cure the Mind
What it is about: Lucilius has traveled to escape his uneasiness and is surprised that it has not gone away. Seneca replies by quoting Socrates: how can travel help you when you drag yourself along wherever you go? What needs to change is the mind, not the scenery.
The idea: Internal problems travel with us.
Application: If you are considering a change of place (job, city, home) to escape dissatisfaction, ask yourself which part of the problem you would pack in your suitcase.
Letter 47: Slaves
What it is about: Seneca criticizes Romans who treated their slaves with contempt and cruelty. "They are slaves," people say. "No: they are human beings," he replies. And he reminds Lucilius that fortune can turn and anyone could find themselves in their place.
The idea: How we treat those with less power reveals our character. The letter does not transcend every limit of its era—Seneca does not call for the abolition of slavery—but it strongly affirms our shared humanity.
Application: Observe this week how you treat the people who serve you or work for you, and find one concrete way to treat them better.
How to Continue
After these ten, you can read the rest in order or choose by theme. Some recommended letters for a second round: Letter 5 (on not making a show of philosophy), Letter 54 (his illness), Letter 63 (grief), Letter 78 (illness and pain), and Letter 91 (the burning of a city and preparing for misfortune).
Common Mistakes
- Trying to read them all at once. The letters are meant to be read unhurriedly.
- Reading them without context. Seneca lived in a slaveholding society under dangerous emperors; some ideas make much more sense when you keep that in mind.
- Idealizing Seneca. He was wealthy and contradictory, and he admitted it himself.
- Stopping at the quotes. Every letter proposes a practice; it is worth doing it.
Conclusion
Ten letters, ten weeks: a short course in practical philosophy written two thousand years ago. Start this week with Letter 1 and its application: write down each night where your time went. Next week, move on to Letter 2. At the end of the ten weeks, reread your notes and choose the letter that helped you most so you can return to it whenever you need it.
References
- Seneca. Letters to Lucilius, 1, 2, 5, 7, 11, 12, 13, 18, 24, 28, 47, 54, 63, 78, and 91.
- Griffin, M. T. (1976). Seneca: A Philosopher in Politics. Oxford University Press.
- Romm, J. (2014). Dying Every Day: Seneca at the Court of Nero. Alfred A. Knopf.
- Graver, M. and Long, A. A. (trans.) (2015). Seneca: Letters on Ethics. University of Chicago Press.